^ It's a bit tricky, as the pebbled leather is quite stiffer than the camelskin. I wear mine (camel) mostly on the shoulder, it kind of bends around a bit. Big winter coats don't make matters any easier either...
I've read in an earlier post that taking off the 'thingy' from the shoulderstrap might help? (although I never tried it, I like to have it on.) Also, I punched an extra hole into the strap, to make it a little longer.